Add PR template

Author: IsabelParedes

.github/pull_request_template.md

@@ -0,0 +1,72 @@
+## Checklist for Adding Packages
+
+### Pre-submission Checks
+- [ ] Package requires building for `emscripten-wasm32` platform (not a noarch package), in other words, the package requires compilation.
+
+### Recipe Structure
+- [ ] Created directory: `recipes/recipes_emscripten/[package-name]/`
+- [ ] Added `recipe.yaml` with proper structure:
+  - [ ] `context` section with `version` (and optionally `name`)
+  - [ ] `package` section with name and version using Jinja2 templates
+  - [ ] `source` section with:
+    - Source URL is valid and points to archive file (`.tar.gz`, `.tar.bz2`, `.tar.xz`, `.tgz`, or `.zip`)
+    - Source URL contains `${{ version }}` template for version updates
+    - SHA256 hash is correct (verified with `curl -sL <url> | sha256sum`)
+    - Patches (if any) are included in `[package-name]/patches/` directory
+  - [ ] `build` section with appropriate script/method
+    - Python packages: `${PYTHON} -m pip install . ${PIP_ARGS}`
+    - R packages: `$R CMD INSTALL $R_ARGS .`
+    - C++ packages: Uses `emcmake`/`emmake` or `emconfigure`/`emmake`
+    - Rust packages: Uses `rust-nightly` and `maturin` or appropriate Rust build tool
+  - [ ] `requirements` section (build, host, run as needed)
+  - [ ] `tests` section
+    - Python packages: `test_import_[package].py` file created and referenced
+    - C++ packages: Test executable or package_contents test
+    - R packages: Package contents test
+  - [ ] `about` section with license, homepage, summary
+
+### Build Verification
+- [ ] (Optional) Locally, recipe builds successfully:
+  ```bash
+  rattler-build build \
+    --package-format tar-bz2 \
+    -c https://repo.prefix.dev/emscripten-forge-4x \
+    -c microsoft \
+    -c conda-forge \
+    --target-platform emscripten-wasm32 \
+    --skip-existing none \
+    -m variant.yaml \
+    --recipe recipes/recipes_emscripten/[package-name]
+  ```
+- [ ] All tests pass
+
+
+## Checklist for Updating Packages
+
+- [ ] ⚠️ Bump build number if the version remains unchanged, or reset build number if updating the package to a newer version
+- [ ] Tests pass
+
+### PR Formatting
+- [ ] PR title follows format: `Add [package-name]` or `Update [package-name] to [version]`
+- [ ] PR description includes:
+  - [ ] Package purpose/description
+  - [ ] Version being added/updated
+  - [ ] Any special build considerations or patches applied
+  - [ ] (Optional) Test results summary
+
+---
+
+## Description
+<!-- Provide a brief description of the package and why it's being added -->
+
+## Package Details
+- **Package Name**: 
+- **Version**: 
+- **Homepage**: 
+- **License**: 
+
+## Build Notes
+<!-- Any special build considerations, patches applied, or issues encountered -->
+
+## Test Results
+<!-- Summary of test results -->